Increased risk of human parvovirus B19 infection in day-care employees: a cohort study among pregnant workers during an epidemic in Finland
Auteur Anita Riipinen
Auteur Markku Sallmén
Auteur Lea Hedman
Auteur Anneli Ojajärvi
Auteur Marja-Liisa Lindbohm
Auteur Mira Meriluoto
Auteur Heljä-Marja Surcel
Auteur Helena Taskinen
Auteur Mika Nuutila
Auteur Riitta Karikoski
Auteur Klaus Hedman
Auteur Maria Söderlund-Venermo
Volume 71
Numéro 12
Pages 836-841
Publication Occupational and Environmental Medicine
ISSN 1470-7926
Date Dec 2014
Résumé BACKGROUND: Human parvovirus B19 (B19V) infection during early pregnancy increases the risk of miscarriage. Studies have inconsistently shown an elevated risk of infection among women with occupational contacts with children. Methodological differences, particularly in defining occupational exposure and in the type of reference group, may explain the conflicting findings. METHODS: This cohort study compared B19V infections in pregnant day-care employees and healthcare professionals during a B19V epidemic in Finland. Women were identified from the files of nationwide trade unions and the National Supervisory Authority for Welfare and Health. Early-pregnancy maternal B19V IgG was analysed in 3710 women, and infections were defined as seroconversions after analysing in parallel the available umbilical cord blood samples of the 847 seronegative mothers. Independently of the serological status, the actual employment during pregnancy was assessed using registered information on employment history. RESULTS: B19V infections were more common among day-care employees (22/331, 6.6%), than among those working in healthcare (12/326, 3.7%). The adjusted HRs of B19V infection, using proportional hazard regression, was 2.63 (95% CI 1.27 to 5.46) among all women and 5.59 (95% CI 1.40 to 22.4) among nulliparous women. CONCLUSIONS: Day-care employees are at an increased risk of B19V infection, which warrants preventive measures.
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doi:10.1136/oemed-2014-102217
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